Dynamo-electric machine.



I PATENTBD JULYBI, 1906.. L. A. TIRRILL.

DYNAMO ELECTRIC MACHINE APPLICATION FILED {BB-17,1905.

2 SHEETS-SHEET 1..

INVENTOR Leon are! 24. T/rri/ f J WM PATENTED JULY 31, 1906.

L. A. TIRRILL.

DYNAMO ELECTRIC MACHINE.

APPLICATION TILED FEB-17. 1905.

2 SHEETS-BEBE! 2.

NITNI ZSSE 62* INVENTOR LeonardfLTirri ll,

JHHZy.

UNITED STATES PATENT OFFICE.

LEONARD A. TIRRILL, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GEN- ERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTR'IC MACHINE.

No. earner.

Specification of Letters Patent,

Patented July 31, 1906.

Application filed February 17, 1905. Serial No. 246,012.

w more units or machines, such as a motor and a generator or the like, in a very compact manner and so as to minimize the floor-space required by them.

My present invention has for its object the attainment of the above-noted features, and comprises novel features of construction and arrangement, which are pointed out with particularity in the claims annexed to and forming a part of this specification.

For a better understanding of my invention reference may be had to the accom anying drawings and description, in which have illustrated and described one embodiment ofv my invention.

Of the drawings, Figure 1 is a sectional elevation showing a dynamo-electric machine constructed iii-accordance with my invention; and Fig. 2 is a partial section on the line 2 2 of Fig. 1, showing certain details of construction.

Referring to the drawings, 1 represents the base member of a vertical motor-generator set suitable for use in signal-towers or the like where compactness and the use of a minimum amount of floor-space is desirable. On the base 1 is mounted the field-ring 2 of the lower unit of the machine. The field-ring and the base 1 are secured together by bolts 3. The field-ring 4 of the upper unit of'the machine is secured to the upper end of fieldring 2 by bolts 5, which are parallel to the axis of the rings .2 and 4. As shown, the upper field-ring is cut away to form spaces 4, which permit the insertion of the bolts 5 in threaded openings which are formed in the end of the field-ring 2. A top member 6 is secured to the upper endofthe field-ring 4 by bolts 7. The base memb'er carries a bearing 8 and the top member 6\a bearing 9. A

shaft 10, j ournaled in the bearings 8 and 9, carries armatures 11 and 12, which cooperate with the field-rings 2 and 3 res ectively.

In the construction shown the pole-pieces 13 for the lower unit of the machine are integral with the field-ring 2, though separate pole tips 14 are employed. In the construction shown the ring 2 and the polepieces 13 are preferably formed of caststeel. The pole-tips 14 are secured in place by bolts 15. units are shown as laminated and are secured by suitable bolts 16 to the ring 4, which may in theconstruction shown be advantageously formed of cast-iron. The pole-pieces for the upper and lower units are surrounded by windings 17 and 18 of the usual form.

The armature for the lower unit, which 1n the particular construction illustrated 1s a direct-current motor, is provided with a commutator 19. The brush-holders 20, cooperating with the commutator 19, are carried by a bracket 21, which is adjustably secured to the upper field-ring 4 by .bolts 22. Where, as in the present case the upper field-ring 1s of cast-iron and the lower ring is of cast-steel, there is some advantage in providing the space necessary for the commutator and brush-holders of the lower unit by increasing the length of the cast-iron field-ring rather than by increasing the length of the cast-steel The armature for the upper unit, which in the particular construction shown is a selfexciting alternating-current generator, is provided with a commutator 23 for supplying direct current to the windings 17 and with a collector-ring 24 for supplying alternating current to the external circuit. The brushholders 25 and 26 for the upper unit are carried by a yoke 27, which is mounted in the usual way on the bearing-box 9, carried by the upper end member 6. f

i The construction described is exceedingly simple and compact. The arts to be fitted together canbe readily mac 'ned'and a very rigid mechanical construction is obtained. By the employment of a vertical unit the minimum amount of floor-space is used. By connecting the field-rings directly together both material and space are economized.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In combination, a pair of field-rings, both of said field-rings being vertically disposed and one placed directly on top of and secured to the other, a shaft, and two revolv ing elements carried thereby, one of said ele- The pole-pieces for the upper ments co operating with one of said field-rings rings being placed with their axes vertical and in alinement with each other, and one of said field-rings being placed above and directly secured to the other.

3. In combination, a pair of dynamo-electric-machine field-rings, placed one above the other and with their axes in alinement, one of said field-rings being formed with openings or spaces in the end adjacent the other fieldring, and bolts for securing the field-rings together inserted in said spaces and extending parallel to the axes of said machines.

4. In con'ibination, a base, a lower fieldring secured thereto with its axis vertically disposed, an upper field-ring with its lower end resting on and secured to the upper end of the lower field-ring, a shaft and two armatures carried thereby, one cooperating with one of said field-rings and the other with the other of said field-rings, a commutator'for one of said armatures, and a bruslbholder cooperating therewith carried by thefield-ring cooperating with the other armature.

5, In a vertical-shaft motor-generator, a motor field-ring formed of cast-steel, a generator field-ring formed of cast-iron resting upon the upper end of the first-mentioned field-ring and directly secured thereto, a vertical shaft and two arn'iatures carried thereby, one armature coopera ng with the lower field-ring and the other with the upperfield= ring, a commutator for the lower armature, and brush-holders cooperating therewith se cured to the upper field-ring.

6. In combination, a field-ring having its axis vertically disposed, a second fieldring placed with its lower end resting on and supported by the uppenend of the first-mentioned field-ring, me ans for securing the fieldrings together, one of said field-rings being formed of cast-iron and the other of caststeel, armatures cooperating with the fieldrings, and brush-holders for the armatures cooperating with the field-ring formed of cast-steel supported by the field-ring formed of cast-iron.

7. In combination, a base, a field-ring secured thereto and arranged with its axis vertically disposed, a second field-ring with its lower end resting on and secured to the upper end of the first-mentioned field-ring, a top member secured to the upper end of the upper field-ring, a vertical shaft having one end journaled in the base and the other in the top member, and two armatures carried by said shaft, one of said armatures cooperating with the lower field-ring, and the other of said ar-' matures cooperating with the upper field- I n witness whereof I have hereunto set my hand this 14th day of February, 1905.

LEONARD A. TIRRILL.

'Witnesses: T

JOHN A. MoMANUs, Jr., DUGALD MoK. MCKILLOP. 

